Related

Cookies are read and written through ActionController#cookies. The cookies being read are
what were received along with the request, the cookies being written
are what will be sent out with the response. Cookies are read by value (so
you won’t get the cookie object itself back
— just the value it holds). Examples for writing:

cookies[:user_name]="david"# => Will set a simple session cookiecookies[:login]={:value=>"XJ-122",:expires=>Time.now+360}# => Will set a cookie that expires in 1 hour